Color-converting substrate and display device including the same

ABSTRACT

A color-converting substrate includes a color-converting part including a wavelength-converting particle configured to change a wavelength of an incident light to emit a light having a color different from the incident light, a color filter pattern filtering the light emitted from the color-converting part, and a light-reflective layer disposed between the color-converting part and the color filter pattern to selectively reflect a light having a wavelength same as the wavelength of the incident light.

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority from and the benefit of Korean PatentApplication No. 10-2020-0025204 filed on Feb. 28, 2020, which is herebyincorporated by reference for all purposes as if fully set forth herein.

BACKGROUND Field

Exemplary embodiments/implementations of the invention relate generallyto a color-converting substrate and, more specifically, to embodimentsrelate to a color-converting substrate and a display device includingthe color-converting substrate.

Discussion of the Background

An organic light-emitting display device is a self-emission displaydevice, which is capable of generating a color image without anadditional light source such as a backlight.

Recently, an organic light-emitting display device including a colorfilter and a color-converting part is being developed for improving adisplay quality. The color-converting part may change a wavelength of alight generated by a light-emitting element. Thus, the color-convertingpart may output a light having a color different from an incident light.For example, the color-converting part may include awavelength-converting material such as a quantum dot.

The above information disclosed in this Background section is only forunderstanding of the background of the inventive concepts, and,therefore, it may contain information that does not constitute priorart.

SUMMARY

Embodiments provide a color-converting substrate with improved lightefficiency.

Embodiments provide a display device with improved light efficiency.

Additional features of the inventive concepts will be set forth in thedescription which follows, and in part will be apparent from thedescription, or may be learned by practice of the inventive concepts.

According to an embodiment, a color-converting substrate includes acolor-converting part including a wavelength-converting particleconfigured to change a wavelength of an incident light to emit a lighthaving a color different from the incident light, a color filter patternfiltering the light emitted from the color-converting part, and alight-reflective layer disposed between the color-converting part andthe color filter pattern to selectively reflect a light having awavelength same as the wavelength of the incident light.

In an embodiment, the light-reflective layer covers a light-exitingsurface and a side surface of the color-converting part.

In an embodiment, the light-reflective layer has a stacked structureincluding a plurality of layers having different refractive indexes.

In an embodiment, the light-reflective layer includes a wire-gridpattern.

In an embodiment, the light-reflective layer includes a nano-particleincluding silver.

In an embodiment, the nano-particle includes an oxide core and a metalshell including silver.

In an embodiment, the color-converting substrate further includes acompensation part configured to transmit an incident light withoutchanging a wavelength of the incident light, wherein the compensationpart does not overlap the light-reflective layer.

In an embodiment, the incident light is a blue light.

In an embodiment, the wavelength-converting particle includes a quantumdot.

In an embodiment, the color-converting part further includes ascattering particle.

According to an embodiment, a display device includes a first substrateincluding an array of pixels, and a second substrate combined with thefirst substrate. The second substrate includes a color-converting partincluding a wavelength-converting particle configured to change awavelength of an incident light to emit a light having a color differentfrom the incident light, a color filter pattern filtering the lightemitted from the color-converting part, and a light-reflective layerdisposed between the color-converting part and the color filter patternto selectively reflect a light having a wavelength same as thewavelength of the incident light.

According to an embodiment, a display device includes an array ofpixels, an encapsulation layer covering the pixels, a color-convertingpart disposed on the encapsulation layer and including awavelength-converting particle configured to change a wavelength of anincident light to emit a light having a color different from theincident light, a color filter pattern disposed on the color-convertingpart and configured to filter the light emitted from thecolor-converting part, and a light-reflective layer disposed between thecolor-converting part and the color filter pattern to selectivelyreflect a light having a wavelength same as the wavelength of theincident light.

According to embodiments, a light passing through a color-convertingpart without changing a wavelength thereof may be reflected inwardly thecolor-converting parts. Thus, the light may be prevented from beingabsorbed by a color filter, and may be reused. Thus, a light efficiencyof a color-converting substrate and a display device may be improved.

Thus, an amount of a scattering particle in the color-converting partmay be reduced, or the scattering particle may be omitted.

When a light efficiency of the color-converting substrate is improved, adesired thickness of the color-converting part be reduced. Thus, anadditional photolithography process of forming a partition wall having amulti-layered structure may be omitted.

Furthermore, when a light efficiency of the color-converting substrateis improved, an amount of a dye or a pigment in the color filter may bereduced.

It is to be understood that both the foregoing general description andthe following detailed description are exemplary and explanatory and areintended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this specification, illustrate exemplary embodiments of theinvention, and together with the description serve to explain theinventive concepts.

Features of embodiments of the invention will be more clearly understoodfrom the following detailed description taken in conjunction with theaccompanying drawings.

FIG. 1 is a plan view illustrating a pixel area of a display deviceaccording to an embodiment.

FIG. 2 is a cross-sectional view taken along the line I-I′ of FIG. 1.

FIGS. 3, 4, and 5 are enlarged cross-sectional views illustrating theregion ‘A’ of

FIG. 2.

FIGS. 6, 7, 8 and 9 are cross-sectional views illustrating a method ofmanufacturing a color-converting substrate according to an embodiment.

FIGS. 10, 11, 12, 13 and 14 are cross-sectional views illustrating adisplay device according to embodiments.

DETAILED DESCRIPTION

In the following description, for the purposes of explanation, numerousspecific details are set forth in order to provide a thoroughunderstanding of various exemplary embodiments or implementations of theinvention. As used herein “embodiments” and “implementations” areinterchangeable words that are non-limiting examples of devices ormethods employing one or more of the inventive concepts disclosedherein. It is apparent, however, that various exemplary embodiments maybe practiced without these specific details or with one or moreequivalent arrangements. In other instances, well-known structures anddevices are illustrated in block diagram form in order to avoidunnecessarily obscuring various exemplary embodiments. Further, variousexemplary embodiments may be different, but do not have to be exclusive.For example, specific shapes, configurations, and characteristics of anexemplary embodiment may be used or implemented in another exemplaryembodiment without departing from the inventive concepts.

Unless otherwise specified, the illustrated exemplary embodiments are tobe understood as providing exemplary features of varying detail of someways in which the inventive concepts may be implemented in practice.Therefore, unless otherwise specified, the features, components,modules, layers, films, panels, regions, and/or aspects, etc.(hereinafter individually or collectively referred to as “elements”), ofthe various embodiments may be otherwise combined, separated,interchanged, and/or rearranged without departing from the inventiveconcepts.

The use of cross-hatching and/or shading in the accompanying drawings isgenerally provided to clarify boundaries between adjacent elements. Assuch, neither the presence nor the absence of cross-hatching or shadingconveys or indicates any preference or requirement for particularmaterials, material properties, dimensions, proportions, commonalitiesbetween illustrated elements, and/or any other characteristic,attribute, property, etc., of the elements, unless specified. Further,in the accompanying drawings, the size and relative sizes of elementsmay be exaggerated for clarity and/or descriptive purposes. When anexemplary embodiment may be implemented differently, a specific processorder may be performed differently from the described order. Forexample, two consecutively described processes may be performedsubstantially at the same time or performed in an order opposite to thedescribed order. Also, like reference numerals denote like elements.

When an element, such as a layer, is referred to as being “on,”“connected to,” or “coupled to” another element or layer, it may bedirectly on, connected to, or coupled to the other element or layer orintervening elements or layers may be present. When, however, an elementor layer is referred to as being “directly on,” “directly connected to,”or “directly coupled to” another element or layer, there are nointervening elements or layers present. To this end, the term“connected” may refer to physical, electrical, and/or fluid connection,with or without intervening elements. Further, the D1-axis, the D2-axis,and the D3-axis are not limited to three axes of a rectangularcoordinate system, such as the x, y, and z-axes, and may be interpretedin a broader sense. For example, the D1-axis, the D2-axis, and theD3-axis may be perpendicular to one another, or may represent differentdirections that are not perpendicular to one another. For the purposesof this disclosure, “at least one of X, Y, and Z” and “at least oneselected from the group consisting of X, Y, and Z” may be construed as Xonly, Y only, Z only, or any combination of two or more of X, Y, and Z,such as, for instance, XYZ, XYY, YZ, and ZZ. As used herein, the term“and/or” includes any and all combinations of one or more of theassociated listed items.

Although the terms “first,” “second,” etc. may be used herein todescribe various types of elements, these elements should not be limitedby these terms. These terms are used to distinguish one element fromanother element. Thus, a first element discussed below could be termed asecond element without departing from the teachings of the disclosure.

Spatially relative terms, such as “beneath,” “below,” “under,” “lower,”“above,” “upper,” “over,” “higher,” “side” (e.g., as in “sidewall”), andthe like, may be used herein for descriptive purposes, and, thereby, todescribe one elements relationship to another element(s) as illustratedin the drawings. Spatially relative terms are intended to encompassdifferent orientations of an apparatus in use, operation, and/ormanufacture in addition to the orientation depicted in the drawings. Forexample, if the apparatus in the drawings is turned over, elementsdescribed as “below” or “beneath” other elements or features would thenbe oriented “above” the other elements or features. Thus, the exemplaryterm “below” can encompass both an orientation of above and below.Furthermore, the apparatus may be otherwise oriented (e.g., rotated 90degrees or at other orientations), and, as such, the spatially relativedescriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particularembodiments and is not intended to be limiting. As used herein, thesingular forms, “a,” “an,” and “the” are intended to include the pluralforms as well, unless the context clearly indicates otherwise. Moreover,the terms “comprises,” “comprising,” “includes,” and/or “including,”when used in this specification, specify the presence of statedfeatures, integers, steps, operations, elements, components, and/orgroups thereof, but do not preclude the presence or addition of one ormore other features, integers, steps, operations, elements, components,and/or groups thereof. It is also noted that, as used herein, the terms“substantially,” “about,” and other similar terms, are used as terms ofapproximation and not as terms of degree, and, as such, are utilized toaccount for inherent deviations in measured, calculated, and/or providedvalues that would be recognized by one of ordinary skill in the art.

Various exemplary embodiments are described herein with reference tosectional and/or exploded illustrations that are schematic illustrationsof idealized exemplary embodiments and/or intermediate structures. Assuch, variations from the shapes of the illustrations as a result, forexample, of manufacturing techniques and/or tolerances, are to beexpected. Thus, exemplary embodiments disclosed herein should notnecessarily be construed as limited to the particular illustrated shapesof regions, but are to include deviations in shapes that result from,for instance, manufacturing. In this manner, regions illustrated in thedrawings may be schematic in nature and the shapes of these regions maynot reflect actual shapes of regions of a device and, as such, are notnecessarily intended to be limiting.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this disclosure is a part. Terms,such as those defined in commonly used dictionaries, should beinterpreted as having a meaning that is consistent with their meaning inthe context of the relevant art and should not be interpreted in anidealized or overly formal sense, unless expressly so defined herein.

A color-converting substrate and a display device according toembodiments of the invention will be described hereinafter withreference to the accompanying drawings, in which some embodiments areillustrated. Same or similar reference numerals may be used for same orsimilar elements in the drawings.

FIG. 1 is a plan view illustrating a pixel area of a display deviceaccording to an embodiment. FIG. 2 is a cross-sectional view taken alongthe line I-I′ of FIG. 1. FIGS. 3 to 5 are enlarged cross-sectional viewsillustrating the region ‘A’ of FIG. 2.

Referring to FIGS. 1 and 2, a display device according to an embodimentincludes a first substrate 100 and a second substrate 200. The firstsubstrate 100 includes an array of pixels. Each of pixels may include alight-emitting element generating a light in response to a drivingsignal.

The second substrate 200 includes a color-converting part changing awavelength of the light generated by the light-emitting element.Furthermore, the second substrate 200 includes a color filtertransmitting a light having a specific color (a specific wavelength).

Referring to FIG. 1, the display device may include a display areagenerating an image and a peripheral area adjacent to or surrounding thedisplay area. The display area may include a plurality of pixel areas.Each of the pixel areas may include a light-emitting area (LA1-LA3)emitting a light and a light-blocking area BA surrounding thelight-emitting area. The light generated in the display device may exitoutwardly through the light-emitting area.

The light-emitting area may emit lights having different colors. Forexample, the display device may include a first light-emitting area LA1emitting a first color light, a second light-emitting area LA2 emittinga second color light and a third light-emitting area LA3 emitting athird color light.

In an embodiment, the first light-emitting area LA1 may emit a bluelight, the second light-emitting area LA2 may emit a red light, and thethird light-emitting area LA3 may emit a green light. However,embodiments are not limited thereto. For example, light-emitting areasmay be configured or combined to emit a yellow light, cyan light and amagenta light.

Furthermore, light-emitting areas may emit at least four color lights.For example, light-emitting areas may be configured or combined to emitat least one of a yellow light, cyan light and a magenta light inaddition to a red light, a blue light and a green light. Furthermore,light-emitting areas may be configured or combined to further emit awhite light.

In an embodiment, the light-emitting areas LA1, LA2 and LA3 may have asubstantially rectangular shape, respectively. However, embodiments arenot limited thereto. For example, the light-emitting areas LA1, LA2 andLA3 may have different shapes from each other. Furthermore, thelight-emitting areas LA1, LA2 and LA3 may have various shapes such as asquare shape, a rhombus shape, a triangular shape, a circular shape orthe like. An edge or a corner of each of light-emitting areas LA1, LA2and LA3 may have a round shape or may be chamfered.

In an embodiment, the light-emitting areas LA1, LA2 and LA3 may havedifferent sizes from each other. However, embodiments are not limitedthereto. For example, the light-emitting areas LA1, LA2 and LA3 may havea same size.

Referring to FIG. 2, the first substrate 100 includes driving elementsTR1, TR2 and TR3 disposed on a base substrate 110. The driving elementsTR1, TR2 and TR3 may be electrically connected to a correspondinglight-emitting element. The light-emitting element may be an organiclight-emitting diode. For example, the organic light-emitting diode mayinclude a first electrode EL1, a second electrode EL2 and an organiclight-emitting layer OL disposed between the first electrode EL1 and thesecond electrode EL2.

For example, the base substrate 110 may include glass, quartz, sapphire,a polymeric material or the like.

In an embodiment, the driving elements TR1, TR2 and TR3 may include athin film transistor. Each of the driving elements TR1, TR2 and TR3 mayinclude a plurality of thin film transistors.

For example, a channel layer of the thin film transistor may includeamorphous silicon, multi-crystalline silicon (polysilicon), a metaloxide. For example, the metal oxide two-component compound (ABx),ternary compound (ABxCy) or four-component compound (ABxCyDz), whichcontains indium (In), zinc (Zn), gallium (Ga), tin (Sn), titanium (Ti),aluminum (Al), hafnium (Hf), zirconium (Zr), magnesium (Mg). Forexample, the metal oxide may include zinc oxide (ZnOx), gallium oxide(GaOx), titanium oxide (TiOx), tin oxide (SnOx), indium oxide (InOx),indium-gallium oxide (IGO), indium-zinc oxide (IZO), indium tin oxide(ITO), gallium zinc oxide (GZO), zinc magnesium oxide (ZMO), zinc tinoxide (ZTO), zinc zirconium oxide (ZnZrxOy), indium-gallium-zinc oxide(IGZO), indium-zinc-tin oxide (IZTO), indium-gallium-hafnium oxide(IGHO), tin-aluminum-zinc oxide (TAZO), indium-gallium-tin oxide (IGTO)or the like.

The driving element TR may be covered by an insulation structure 120.The insulation structure may include a combination of an inorganicinsulation layer and an organic insulation layer.

The first electrode EL1 may function as an anode. For example, the firstelectrode EL1 may be formed as a transmitting electrode or a reflectingelectrode according to an emission type of the display device (a frontemission type or a rear emission type). When the first electrode EL1 isa reflecting electrode, the first electrode EL1 may include gold (Au),silver (Ag), aluminum (Al), copper (Cu), nickel (Ni), platinum (Pt),magnesium (Mg), chromium (Cr), tungsten (W), molybdenum (Mo), titanium(Ti) or a combination thereof, and may have a stacked structure furtherincluding a metal oxide layer including indium tin oxide, indium zincoxide, zinc tin oxide, indium oxide, zinc oxide, tin oxide or the like.

A pixel-defining layer PDL is disposed on the insulation structure 120,and has an opening overlapping at least a portion of the first electrodeEL1. For example, the pixel-defining layer PDL may include an organicinsulating material. At least a portion of the organic light-emittinglayer OL may be disposed in the opening of the pixel-defining layer PDL.In an embodiment, the organic light-emitting layer OL may extendcontinuously over a plurality of pixel areas in the display area. Inanother embodiment, the organic light-emitting layer OL may be formed asa pattern separated from a light-emitting layer of an adjacent pixel.

The organic light-emitting layer OL may include at least alight-emitting layer, and may further include at least one of a holeinjection layer (HIL), a hole transporting layer (HTL), an electrontransporting layer (ETL) and an electron injection layer (EIL). Forexample, the organic light-emitting layer OL may include a low molecularweight organic compound or a high molecular weight organic compound.

In an embodiment, the organic light-emitting layer OL may generate ablue light. However, embodiments are not limited thereto. For example,the organic light-emitting layer OL may generate a red light, a greenlight or the like. In another embodiment, the organic light-emittinglayer OL may generate lights having different colors in differentpixels.

The second electrode EL2 may be formed as a transmitting electrode or areflecting electrode according to an emission type of the displaydevice. For example, the second electrode EL2 may include a metal, ametal alloy, a metal nitride, a metal fluoride, a conductive metal oxideor a combination thereof. For example, the second electrode EL2 may beformed as a common layer extending continuously over a plurality ofpixels in the display area DA.

The first substrate 100 may further include an encapsulation layer 130covering light-emitting elements. The encapsulation layer 130 may extendcover an entire portion of the display area.

For example, the encapsulation layer 130 may have a stacked structure ofan inorganic thin film and an organic thin film. For example, asillustrated in FIG. 2, the encapsulation layer 130 may include a firstinorganic thin film 132, an organic thin film 134 disposed on the firstinorganic thin film 132, and a second inorganic thin film 136 disposedon the organic thin film 134. However, embodiments are not limitedthereto. For example, the encapsulation layer 130 may have a structureincluding at least two organic thin films and at least three inorganicthin films.

For example, the organic thin film 134 include a cured resin such aspolyacrylate, epoxy resin or the like. For example, the cured resin maybe formed from cross-linking reaction of monomers. For example, theinorganic thin films 132 and 136 may include an inorganic material suchas silicon oxide, silicon nitride, silicon carbide, aluminum oxide,tantalum oxide, hafnium oxide, zirconium oxide, titanium oxide or thelike.

The second substrate 200 includes a color-converting part. Thecolor-converting part changes a wavelength of a light L1 generated bythe light-emitting element of the first substrate 100, and emits a lighthaving a color different from the incident light L1. Furthermore, thesecond substrate 200 includes a color filter overlapping thecolor-converting part.

The color filter may be disposed between a base substrate 210 and thecolor-converting part. The color filter filters a light passing throughthe color filter to transmit a light having a specific color.

In an embodiment, the color filter may include a first color filterpattern 222, a second color filter pattern 224 and a third color filterpattern 226. The color filter patterns may overlap a correspondinglight-emitting area. Thus, a color of lights L2R, L2B and L2G exitingfrom the light-emitting areas may be determined by the color filters.

In an embodiment, the first color filter pattern 222 overlaps the firstlight-emitting area LA1. For example, the first color filter pattern 222may selectively transmit a blue light. The second color filter pattern224 overlaps the second light-emitting area LA2. For example, the secondcolor filter pattern 224 may selectively transmit a red light. The thirdcolor filter pattern 226 overlaps the third light-emitting area LA3. Forexample, the third color filter pattern 226 may selectively transmit agreen light.

In the inventive concepts, “first”, “second” or the like are not usedfor specific components. For example, a light-emitting area emitting ared light or a green light may be referred as to a first light-emittingarea, and a red color filter pattern or a green color filter pattern maybe referred as to a first color filter pattern.

The color filter may further include a light-blocking pattern 223overlapping the light-blocking area BA. The light-blocking pattern 223may be formed from a same layer as the first color filter pattern 222and may be continuously connected to the first color filter pattern 222.In an embodiment, the light-blocking pattern 223 may be formed entirelyin the light-blocking area BA. The light-blocking pattern 223 mayprevent color mixture of pixel areas adjacent to each other.

The second substrate 200 may further include a first protective layer240 covering the color filter. The first protective layer 240 mayinclude an inorganic material such as silicon oxide, silicon nitride orthe like.

The color-converting part overlaps a corresponding light-emitting area.For example, the second substrate 200 may include a firstcolor-converting part 232 overlapping the second light-emitting areaLA2.

The first color-converting part 232 may include a wavelength-convertingparticle 232 b and a resin part 232 a.

For example, the wavelength-converting particle 232 b may include aquantum dot. The quantum dot may be defined as a nano-crystallinesemiconductor material. The quantum dot may absorb an incident light andemit a light having a wavelength different from the incident light. Forexample, the quantum dot may have a diameter equal to or less than 100nm. In an embodiment, the quantum dot may have a diameter of 1 nm to 20nm.

For example the quantum dot may include a II-VI group compound, a III-Vgroup compound, a IV-VI group compound, a IV group element, a IV groupcompound or a combination thereof.

For example, the II-VI group compound may include a binary compoundselected from CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe,MgS and a combination thereof, a ternary compound selected from CdSeS,CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS,CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe,MgZnS and a combination thereof, or a quaternary compound selected fromHgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe,HgZnSeS, HgZnSeTe, HgZnSTe and a combination thereof.

For example, the III-V group compound may include a binary compoundselected from GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP,InAs, InSb and a combination thereof, a ternary compound selected fromGaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb,InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP and a combination thereof, or aquaternary compound selected from GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb,GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb,InAlPAs, InAlPSb and a combination thereof.

For example, the IV-VI group compound may include a binary compoundselected from SnS, SnSe, SnTe, PbS, PbSe, PbTe and a combinationthereof, a ternary compound selected from SnSeS, SnSeTe, SnSTe, PbSeS,PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe and a combination thereof, or aquaternary compound selected from SnPbSSe, SnPbSeTe, SnPbSTe and acombination thereof.

For example, the IV group element may include Si, Ge or a combinationthereof. The IV group compound may include a binary compound selectedfrom SiC, SiGe and a combination thereof.

For example, the quantum dot may have a core-shell structure including acore and a shell which surrounds the core. In an embodiment, forexample, the core and the shell may include different materials.

For example, the quantum dot may be dispersed in the resin part 232 a.For example, the resin part 232 a may include an epoxy resin, an acrylicresin, a phenolic resin, a melamine resin, a cardo resin, an imide resinor the like.

The first color-converting part 232 may further include a scatteringparticle 232 c. The scattering particle 232 c may scatter an incidentlight without substantially changing a wavelength of the incident lightthereby increasing a path of a light progressing in the color-convertingpart.

The scattering particle 232 c may include a metal oxide or an inorganicmaterial. For example, the metal oxide may include titanium oxide,zirconium oxide, aluminum oxide, indium oxide, zinc oxide, tin oxide orthe like. For example, the organic material may include an acrylicresin, an urethane resin or the like.

For example, a light-emitting diode corresponding to the secondlight-emitting area LA2 may generate a blue light L1 having a peak in arange of about 440 nm to about 480 nm. The first color-converting part232 changes a wavelength of the blue light L1 incident thereon to emit ared light. A remainder of the blue light L1, which is not color-changedin the first color-converting part 232, is blocked by the second colorfilter pattern 224. Thus, the second light-emitting area LA2 mayselectively emit a red light L2R. For example, the red light L2R mayhave a peak in a range of about 610 nm to about 650 nm.

The second substrate 200 may further include a second color-convertingpart 234 overlapping the third light-emitting area LA3. The secondcolor-converting part 234 may include a wavelength-converting particle234 b and a resin part 234 a.

For example, a light-emitting diode corresponding to the thirdlight-emitting area LA3 may generate a blue light L1. The secondcolor-converting part 234 changes a wavelength of the blue light L1incident thereon to emit a green light. A remainder of the blue lightL1, which is not color-changed in the second color-converting part 234,is blocked by the third color filter pattern 226. Thus, the thirdlight-emitting area LA3 may selectively emit a green light L2G. Forexample, the green light L2G may have a peak in a range of about 510 nmto about 550 nm.

The second substrate 200 may further include a compensation part 238overlapping the first light-emitting area LA1. The compensation part 238may not include a wavelength-converting material. Thus, the blue lightL1 entering the compensation part 238 may pass through the compensationpart 238 to enter the first color filter pattern 222 withoutsubstantially changing a color thereof. Thus, the first light-emittingarea LA1 may emit a blue light L2B.

The compensation part 238 may include a resin part 238 a. For example,the resin part 238 a may include a same material as the resin parts 232a and 234 a of the color-converting parts 232 and 234. The compensationpart 238 may further include a scattering particle 238 c.

In another embodiment, the compensation part 238 may further include a awavelength-converting particle such as a quantum dot to increase a colorquality, a color-converting efficiency or the like. For example, thewavelength-converting particle may change a wavelength of a UV or a nearUV to emit a blue light.

The second substrate 200 includes a partition wall 250 surrounding thecolor-converting parts 232 and 234 and the compensation part 238. Thepartition wall 250 may form a space receiving an ink compositionconfigured to form the color-converting parts 232 and 234 and thecompensation part 238. Thus, the partition wall 250 may have a gridshape or a matrix shape, in a plan view.

For example, the partition wall 250 may include an organic material suchas an epoxy resin, a phenolic resin, an acrylic resin, a silicone resinor the like.

In an embodiment, the partition wall 250 may include a light-blockingmaterial to function as a black matrix. For example, at least a portionof the partition wall 250 may include a light-blocking material such asa pigment, a dye, a carbon black or the like. For example, the partitionwall 250 may entirely overlap the light-blocking area BA.

The partition wall 250 may have a single-layered structure or amulti-layered structure. For example, the partition wall 250 may besupposed to have a predetermined thickness to function receiving an inkcomposition. Thus, the partition wall 250 may have a multi-layeredstructure.

The second substrate 200 includes a light-reflective layer 260 disposedbetween the color filter and the color-converting part. Thelight-reflective layer 260 may selectively reflect an incident light.

In an embodiment, the light-reflective layer 260 may be disposed tooverlap the second light-emitting area LA2 and the third light-emittingarea LA3, and may not overlap the first light-emitting area LA1. Forexample, the light-reflective layer 260 may have an opening overlappingthe first light-emitting area LA1.

For example, the light-reflective layer 260 may selectively reflect ablue light. Thus, a red light or a green light may pass through thelight-reflective layer 260 to outwardly exit through the secondlight-emitting area LA2 and the third light-emitting area LA3.

In an embodiment, the light-reflective layer 260 may have DistributedBragg Reflector (DBR) structure. For example, as illustrated in FIG. 3,the light-reflective layer 260 may have a stacked structure including aplurality of layers including different refractive indices. For example,the light-reflective layer 260 may have a structure wherein firstrefractive layers 261 and 263 having a first refractive index and secondrefractive layers 262 and 264 having a second refractive index arealternately stacked. For example, the first refractive layers 261 and263 may include titanium oxide, and the second refractive layers 262 and264 may include silicon oxide.

However, embodiments are not limited thereto. The light-reflective layer260 may have various configurations depending on a wavelength of a lightto be reflected and conditions for DBR.

In an embodiment, a light-reflective layer may have a nano-patteredshape. For example, as illustrated in FIG. 4, a light-reflective layer260′ may include a wire-grid pattern. The wire-grid pattern may includea metal or an inorganic material such as silicon oxide, silicon nitrideor the like. The wire-grid pattern may be disposed on an incidentsurface on which a light is incident.

For example, as illustrated in FIG. 4, the wire-grid pattern may includea base layer 265 a and protruding portions 265 b protruding from thebase layer 265 a. The protruding portions 265 b may have a linear shapeextending in a direction, and may be arranged in a directionperpendicular to the extending direction.

In an embodiment, the wire-grid pattern may reflect a blue light. Forexample, a height H1 of the protruding portions 265 b may be about 50 nmto about 70 nm. A thickness H2 of the base layer 265 a may be about 100nm to about 120 nm. A pitch P1 of the protruding portions 265 b may beabout 250 nm to about 300 nm. A width W1 of the protruding portions 265b may have a value obtained by the pitch P1 multiplied by a fill factor.For example, the width W1 of the protruding portions 265 b may be about100 nm to about 150 nm.

However, embodiments are not limited thereto. The wire-grid pattern mayhave various configurations depending on a material of the pattern and awavelength of a light to be reflected.

In an embodiment, a light-reflective layer may include a nano-particle.For example, as illustrated in FIG. 5, a light-reflective layer 260″ mayinclude a nano-particle 266 a. A material and a size of thenano-particle 266 a may be varied depending on a wavelength of a lightto be reflected.

For example, the nano-particle 266 a may include silver to reflect ablue light. The nano-particle 266 a including silver scatters a bluelight more than other lights. In an embodiment, the nano-particle 266 amay have a core-shell structure to adjust a wavelength of a light to bescattered. For example, the nano-particle 266 a may include an oxidecore including silicon oxide or the like, and a metal shell includingsilver. In an embodiment, a diameter of the oxide core may be about 1 nmto about 2 nm, and a thickness of the metal shell may be about 20 nm toabout 40 nm.

In an embodiment, the light-reflective layer 260″ may further include abinder 266 b to disperse the nano-particle 266 a. The light-reflectivelayer 260″ including the nano-particle 266 a and the binder 266 b mayfunction as a low-refractive layer to increase a light-extractingefficiency. For example, the binder 266 b may include an acrylic resin,a silicon resin or the like.

However, embodiments are not limited thereto. For example, thenano-particle 266 a may be provided with a solvent, and then the solventmay be dried. Thus, the nano-particle 266 a may be attached to a surfaceof the partition wall 250 and the first protective layer 240 without abinder.

The second substrate 200 may include a second protective layer 260covering the color-converting parts 232 and 234 and the compensationpart 238. The second protective layer 260 may include an inorganicmaterial such as silicon oxide, silicon nitride or the like.

A filling member 300 may be disposed between the first substrate 100 andthe second substrate 200. The filling member 300 may include an organicmaterial such as a silicone resin, an epoxy resin or the like.Furthermore, the filling member 300 may include an appropriate materialconfigured to match a refractive index.

According to embodiments, a blue light passing through thecolor-converting parts 232 and 234 may be reflected in thecolor-converting parts 232 and 234 by the light-reflective layer 260.Thus, the blue light may be prevented from being absorbed by the colorfilter, and may be reused. Thus, a light efficiency of acolor-converting substrate and a display device may be improved.

In an embodiment, the color-converting parts 232 and 234 may include thescattering particle. However, embodiments are not limited thereto. Forexample, when a light efficiency is sufficiently increased, an amount ofthe scattering particle may be reduced, or the scattering particle maybe omitted.

Furthermore, the light-reflective layer 260 may surround a side surfaceof the color-converting parts 232 and 234 as well as a light-exitingsurface of the color-converting parts 232 and 234 to further improve alight efficiency of the color-converting substrate and the displaydevice.

When a light efficiency of the color-converting substrate is improved, adesired thickness of the color-converting parts 232 and 234 may bereduced. Thus, an additional photolithography process of forming thepartition wall 250 having a multi-layered structure may be omitted.

Furthermore, when a light efficiency of the color-converting substrateis improved, an amount of a dye or a pigment in the color filter may bereduced.

FIGS. 6, 7, 8 and 9 are cross-sectional views illustrating a method ofmanufacturing a color-converting substrate according to an embodiment.

Referring to FIG. 6, a first color filter pattern 222 and alight-blocking pattern 223 are formed on a base substrate 210. The firstcolor filter pattern 222 may overlap a first light-emitting area LA1.The light-blocking pattern 223 may overlap a light-blocking area BAsurrounding a second light-emitting area LA2 and a third light-emittingarea LA3.

In an embodiment, the first color filter pattern 222 and thelight-blocking pattern 223 may be blue filters selectively transmittinga blue light. For example, the first color filter pattern 222 and thelight-blocking pattern 223 may be formed from a color filter compositionincluding a blue pigment and/or a blue dye.

Referring to FIG. 7, a second color filter pattern 224 and a third colorfilter pattern 226 are formed on the base substrate 210.

The second color filter pattern 224 overlaps the second light-emittingarea LA2. The third color filter pattern 226 overlaps the thirdlight-emitting area LA3.

In an embodiment, the second color filter pattern 224 may be a redfilter selectively transmitting a red light. For example, the secondcolor filter pattern 224 may be formed from a color filter compositionincluding a red pigment and/or a red dye.

In an embodiment, the third color filter pattern 226 may be a greenfilter selectively transmitting a green light. For example, the thirdcolor filter pattern 226 may be formed from a color filter compositionincluding a green pigment and/or a green dye.

In embodiments, an order of forming the color filters and positionthereof are not limited to the illustration. For example, the secondcolor filter pattern 224 or the third color filter pattern 226 may beformed prior to the first color filter pattern 222 so that a portion ofthe light-blocking pattern 223 may be disposed on the second colorfilter pattern 224 or the third color filter pattern 226.

Referring to FIG. 8, a first protective layer 240 is formed to cover thecolor filter patterns. A partition wall 250 is formed on the firstprotective layer 240. The first protective layer 240 may be omitted asdesired. Thus, the partition wall 250 may be formed on the color filterpatterns.

The partition wall 250 may overlap the light-blocking area BA betweenlight-emitting areas LA1, LA2 and LA3. For example, the partition wall250 may include an opening overlapping the light-emitting areas LA1, LA2and LA3.

For example, the partition wall 250 may include a first opening OP1overlapping the first light-emitting area LA1, a second opening OP2overlapping the second light-emitting area LA2, and a third opening OP3overlapping the third light-emitting area LA3.

Thereafter, a light-reflective layer 260 is formed on the second colorfilter pattern 224, the third color filter pattern 226 and the partitionwall 250. In an embodiment, the light-reflective layer 260 may overlapat least the second color filter pattern 224 and the third color filterpattern 226. The light-reflective layer 260 may cover an upper surfaceand a side surface of the partition wall 250.

The light-reflective layer 260 may be formed by various methods.

In an embodiment, the light-reflective layer 260 having DBR structure,which is illustrated in FIG. 3, may be formed by forming an inorganiclayer having a multi-layered structure and then removing a portion ofthe inorganic layer, which overlaps the first light-emitting area LA1.

In an embodiment, the light-reflective layer 260′ including thewire-grid pattern, which is illustrated in FIG. 4 may be formed byforming a preliminary layer including an inorganic material or a metal,and etching the preliminary layer to remove the preliminary layer in thefirst light-emitting area LA1 and to partially remove the preliminarylayer in the second light-emitting area LA2, the third light-emittingarea LA3, and the light-blocking area BA.

In an embodiment, the light-reflective layer 260″ including thenano-particle, which is illustrated in FIG. 5 may be formed by forming aphotoresist layer including the nano-particle and then removing aportion of the photoresist layer, which overlaps the firstlight-emitting area LA1. In another embodiment, a photoresistcomposition or an ink, which include the nano-particle, may beselectively provided in the second light-emitting area LA2, the thirdlight-emitting area LA3, and the light-blocking area BA.

Referring to FIG. 9, an ink including a wavelength-converting particleis provided in the openings OP1, OP2 and OP3 of the partition wall 250.

For example, an inkjet printing apparatus may be used to drop the ink.The inkjet printing apparatus may include a head including a pluralityof nozzles 410. The inkjet printing apparatus may provide a firstcomposition, a second composition and a third composition, respectively,in the openings OP1, OP2 and OP3 of the partition wall 250 through thenozzle 410.

In an embodiment, the second and third compositions may include awavelength-converting particle. For example, the second and thirdcompositions may include a wavelength-converting particle, a bindercomponent and a solvent.

For example, the wavelength-converting particle may include a quantumdot. In an embodiment, the second composition may include a quantum dotcapable of emitting a red light, and the third composition may include aquantum dot capable of emitting a green light. The quantum dots mayinclude an organic ligand combined with a surface thereof.

The binder component may include a polymer, a polymerizable monomer or acombination thereof. For example, the polymer may include an aromaticring structure in a main chain thereof. For example, the aromatic ringstructure may include a phenylene group, a biphenylene group, a fluoreneor the like. The polymerizable monomer may contain at least one doublebond between carbon atoms. For example, the polymerizable monomer mayinclude a (meth)acrylate compound.

The solvent may be properly selected or combined from known materials inview of compatibility with other components, dispersion of a quantumdot, a viscosity, a boiling point or the like.

The second and third compositions may further include a scatteringparticle, a photo-initiator, a polymer stabilizer, a leveling agent, acoupling agent or a combination thereof, as desired.

The first composition may include a same material as the second andthird compositions except for excluding the wavelength-convertingparticle. For example, the first composition may include a bindercomponent and a solvent, and may further include a scattering particle,a photo-initiator, a polymer stabilizer, a leveling agent, a couplingagent or a combination thereof, as desired.

The inkjet printing apparatus provides ink drops including acorresponding composition in the openings OP1, OP2 and OP3. Thus, theopenings OP1, OP2 and OP3 may be filled with the correspondingcomposition.

The compositions in the openings OP1, OP2 and OP3 may be cured to form acolor-converting part and a compensation part. For example, thecompositions may be cured by heat and light.

Color-converting substrates and display devices according to embodimentsmay have various configurations depending on a method thereof or thelike.

FIGS. 10, 11, 12, 13 and 14 are cross-sectional views illustrating adisplay device according to embodiments.

Referring to FIG. 10, a light-reflective layer 260 may be disposedbetween a light-blocking matrix 252 and a base substrate 210.

For example, the light-reflective layer 260 may be formed on a firstprotective layer 240. A compensation part 238, a first color-concertingpart 232 and a second color-concerting part 234 may be formed on thefirst protective layer 240. The light-blocking matrix 252 may partiallycover lower surfaces of the compensation part 238, the firstcolor-concerting part 232 and the second color-concerting part 234. Thelight-blocking matrix 252 may include a light-blocking material.

Referring to FIG. 11, a display device according to an embodiment mayhave a single-substrate structure. For example, a first color-convertingpart 152, a second color-converting part 154 and a compensation part 158may be formed on an encapsulation layer 130. The first color-convertingpart 152, the second color-converting part 154 and the compensation part158 may be formed from a photoresist composition.

For example, the first color-converting part 152 may include a resinpart 152 a, a wavelength-converting particle 152 b and a scatteringparticle 152 c. The second color-converting part 154 may include a resinpart 154 a, a wavelength-converting particle 154 b and a scatteringparticle 154 c. The compensation part 158 may include a resin part 158 aand a scattering particle 158 c.

The display device includes a light-reflective layer 140 covering thefirst color-converting part 152 and the second color-converting part154. For example, the light-reflective layer 140 may cover an uppersurface and a side surface of the first color-converting part 152 andthe second color-converting part 154. The light-reflective layer 140 mayhave a substantially same configuration as the previously explainedlight-reflective layer 260.

The display device may further include a low refractive layer 160disposed on the light-reflective layer 140 and the compensation part158. The low refractive layer 160 may have a refractive index smallerthan those of the color-converting parts 152 and 154 and thecompensation part 158. The low refractive layer 160 may increase alight-extracting efficiency so that brightness and durability of thedisplay device may be increased. For example, the low refractive layer160 may have a refractive index equal to or less than 1.3.

The low refractive layer 160 may include a hollow particle to have asuitable refractive index. In an embodiment, the low refractive layer160 may include a hollow particle dispersed in a resin matrix.

The hollow particle may include an inorganic material. For example, thehollow particle may include silica (SiO₂), magnesium fluoride (MgF₂),iron oxide (Fe₃O₄) or a combination thereof.

For example, the resin matrix of the low refractive layer 160 mayinclude an acrylic resin, a siloxane resin, an urethane resin, an imideresin or a combination thereof, which may be properly selected in viewof a refractive index and a processability.

A color filter may be disposed on the low refractive layer 160. In anembodiment, the color filter may include a first color filter pattern182, a second color filter pattern 184 and a third color filter pattern186. The color filter patterns may overlap a corresponding one oflight-emitting areas LA1, LA2 and LA3. A color filter patternoverlapping the compensation pattern 158 may be omitted as desired.

The display device may further include a light-blocking matrix 170. Thelight-blocking matrix 170 may have a shape surrounding a firstlight-emitting area LA1, a second light-emitting area LA2 and a thirdlight-emitting area LA3, in a plan view. A light-blocking area BA may bedefined by the light-blocking matrix 170.

The light-blocking matrix 170 may be disposed on the low refractivelayer 160. For example, the light-blocking matrix 170 may partiallycover the color filter patterns 182, 184 and 186. However, embodimentsare not limited thereto. For example, after a light-blocking matrixincluding opening is formed, color filter pattern may be formed in theopenings.

The display device may further include a protective layer 190 coveringthe light-blocking matrix 170 and the color filter patterns 182, 184 and186. For example, the protective layer 190 may include an organicmaterial, an inorganic material or a combination thereof. In anembodiment, the protective layer 190 may include an inorganic materialsuch as silicon oxide, silicon nitride or the like.

Referring to FIG. 12, a display device may include a light-blockingpattern 183 formed from a same layer as a first color filter pattern182. The light-blocking pattern 183 may function as a light-blockingmatrix.

Referring to FIG. 13, a first color-converting part 152, a secondcolor-converting part 154 and a compensation part 158 may be formed byan inkjet printing method.

For example, a partition wall 172 may be formed on an encapsulationlayer 130. The partition wall 172 may include openings corresponding tolight-emitting areas. Ink compositions may be provided in the openingsto form the first color-converting part 152, the second color-convertingpart 154 and the compensation part 158. The compensation part 158overlaps a first light-emitting area LA1. The first color-convertingpart 152 overlaps a second light-emitting area LA2. The secondcolor-converting part 154 overlaps a third light-emitting area LA3.

A light-reflective layer 140 is formed on the partition wall 172, thefirst color-converting part 152 and the second color-converting part154.

A low refractive layer 160 is formed on the light-reflective layer 140and the compensation part 158. Color filter patterns 182, 184 and 186and a protective layer 190 are formed on the low refractive layer 160.

Referring to FIG. 14, a display device includes a display panel and abacklight assembly 600. The display panel includes a first substrate 100and a second substrate 200.

The first substrate 100 includes an array of pixels. A liquid crystallayer 500 is interposed between the first substrate 100 and the secondsubstrate 200.

A pixel includes a driving element TR1, TR2 and TR3 and a pixelelectrode PE electrically connected to the driving element TR1, TR2 andTR3. The second substrate 200 includes a common electrode CE. However,embodiments are not limited thereto. For example, the common electrodeCE may be included in the first substrate 100.

A first alignment layer AL1 may be disposed on the pixel electrode PE. Asecond alignment layer AL2 may be disposed on the second substrate 200.The first and second alignment layers AL1 and AL2 may include a polymersuch as polyimide, and may be treated by rubbing or photo-orientation tohave a predetermined tilt angle or the like.

The second substrate 200 may have a substantially same configuration asthe previously explained color-converting substrates except for furtherincluding the common electrode CE and the second alignment layer AL2.

A pixel voltage is applied to the pixel electrode PE in response tooperation of the driving element TR1, TR2 and TR3. A common voltage isapplied to the common electrode CE. Orientation of liquid crystalmolecules in the liquid crystal layer 500 is adjusted by an electricfield formed by a difference between the pixel voltage and the commonvoltage. As a result, a transmittance of a light L1 provided by thebacklight assembly 600 may be controlled.

The second substrate 200 includes color-converting parts 232 and 234,which changes a wavelength of the light L1 passing through the liquidcrystal layer 500 to emit a light having a color different from theincident light L1. The second substrate 200 further includes acompensation part 238 transmits the light L1. The second substrate 200further includes color filters overlapping the color-converting parts232 and 234 and the compensation part 238.

For example, the color filters may be disposed on a surface of a basesubstrate 210. The color filters may filter a light passing therethroughto output a light having a specific color.

In an embodiment, the color filters may include a first color filterpattern 222, a second color filter pattern 224 and a third color filterpattern 226. The color filters may overlap a corresponding one oflight-emitting areas LA1, LA2 and LA3. Thus, colors of lights L2R, L2Gand L2B exiting from the light-emitting areas LA1, LA2 and LA3 may bedetermined by the color filters.

In an embodiment, the first color filter pattern 222 overlaps the firstlight-emitting area LA1. For example, the first color filter pattern 222may selectively transmit a blue light. The second color filter pattern224 overlaps the second light-emitting area LA2. For example, the secondcolor filter pattern 224 may selectively transmit a red light. The thirdcolor filter pattern 226 overlaps the third light-emitting area LA3. Forexample, the third color filter pattern 226 may selectively transmit agreen light.

In an embodiment, the second substrate 200 includes a light-reflectivelayer 260 disposed between the color filters and the color-convertingparts 232 and 234. Thus, the light L1 entering the color-convertingparts 232 and 234 may be more reused to improve a light efficiency ofthe display device.

In an embodiment, the light L1 entering the color-converting parts 232and 234 may be a blue light. However, embodiments are not limitedthereto. The light L1 may have various wavelengths. For example, thelight L1 may include a UV ray. When the light L1 includes a UV ray, acolor-converting part including a wavelength-converting particle to emita blue light may be added instead of the compensation part 238.

As explained in the above, a color-converting substrate may be used fora light crystal display device as well. Furthermore, embodiments may beused for various display devices, which may use a color-convertingsubstrate, such as an electroluminescent display device, a micro LEDdisplay device or the like.

Embodiments may be applied to various display devices. For example,embodiment may be applied to vehicle-display device, a ship-displaydevice, an aircraft-display device, portable communication devices,display devices for display or for information transfer, amedical-display device, etc.

The foregoing is illustrative of embodiments and is not to be construedas limiting thereof. Although embodiments have been described, thoseskilled in the art will readily appreciate that many modifications arepossible in the embodiments without materially departing from the novelteachings and features of the invention. Accordingly, all suchmodifications are intended to be included within the scope of theinvention. Therefore, it is to be understood that the foregoing isillustrative of various embodiments and is not to be construed aslimited to the specific embodiments disclosed, and that modifications tothe disclosed embodiments, as well as other embodiments, are intended tobe included within the scope of the invention, as set forth in thefollowing claims and equivalents thereof.

What is claimed is:
 1. A color-converting substrate comprising: acolor-converting part including a wavelength-converting particleconfigured to change a wavelength of an incident light to emit a lighthaving a color different from the incident light; a color filter patternfiltering the light emitted from the color-converting part; and alight-reflective layer disposed between the color-converting part andthe color filter pattern to selectively reflect a light having awavelength same as the wavelength of the incident light.
 2. Thecolor-converting substrate of claim 1, wherein the light-reflectivelayer covers a light-exiting surface and a side surface of thecolor-converting part.
 3. The color-converting substrate of claim 1,wherein the light-reflective layer has a stacked structure including aplurality of layers having different refractive indexes.
 4. Thecolor-converting substrate of claim 1, wherein the light-reflectivelayer includes a wire-grid pattern.
 5. The color-converting substrate ofclaim 1, wherein the light-reflective layer includes a nano-particleincluding silver.
 6. The color-converting substrate of claim 5, whereinthe nano-particle includes an oxide core and a metal shell includingsilver.
 7. The color-converting substrate of claim 1, further comprisinga compensation part configured to transmit an incident light withoutchanging a wavelength of the incident light, wherein the compensationpart does not overlap the light-reflective layer.
 8. Thecolor-converting substrate of claim 7, wherein the incident light is ablue light.
 9. The color-converting substrate of claim 1, wherein thewavelength-converting particle includes a quantum dot.
 10. Thecolor-converting substrate of claim 1, wherein the color-converting partfurther includes a scattering particle.
 11. A display device comprising:a first substrate including an array of pixels; and a second substratecombined with the first substrate, wherein the second substratecomprises: a color-converting part including a wavelength-convertingparticle configured to change a wavelength of an incident light to emita light having a color different from the incident light; a color filterpattern configured to filter the light emitted from the color-convertingpart; and a light-reflective layer disposed between the color-convertingpart and the color filter pattern to selectively reflect a light havinga wavelength same as the wavelength of the incident light.
 12. Thedisplay device of claim 11, wherein the light-reflective layer covers alight-exiting surface and a side surface of the color-converting part.13. The display device of claim 11, wherein the light-reflective layerhas a stacked structure including a plurality of layers having differentrefractive indexes.
 14. The display device of claim 11, wherein thelight-reflective layer includes a wire-grid pattern.
 15. The displaydevice of claim 11, wherein the light-reflective layer includes anano-particle including silver.
 16. The display device of claim 11,wherein the second substrate further includes a compensation partconfigured to transmit an incident light without changing a wavelengthof the incident light, wherein the compensation part does not overlapthe light-reflective layer.
 17. A display device comprising: an array ofpixels; an encapsulation layer covering the pixels; a color-convertingpart disposed on the encapsulation layer and including awavelength-converting particle configured to change a wavelength of anincident light to emit a light having a color different from theincident light; a color filter pattern disposed on the color-convertingpart and configured to filter the light emitted from thecolor-converting part; and a light-reflective layer disposed between thecolor-converting part and the color filter pattern to selectivelyreflect a light having a wavelength same as the wavelength of theincident light.
 18. The display device of claim 17, wherein thelight-reflective layer has a stacked structure including a plurality oflayers having different refractive indexes.
 19. The display device ofclaim 17, wherein the light-reflective layer includes a wire-gridpattern.
 20. The display device of claim 17, wherein thelight-reflective layer includes a nano-particle including silver.